diff --git a/htdocs/core/js/lib_notification.js.php b/htdocs/core/js/lib_notification.js.php
index 769e0a36157..250eb0231a6 100644
--- a/htdocs/core/js/lib_notification.js.php
+++ b/htdocs/core/js/lib_notification.js.php
@@ -37,8 +37,9 @@ if (!($_SERVER['HTTP_REFERER'] === $dolibarr_main_url_root.'/' || $_SERVER['HTTP
     top_httphead('text/javascript; charset=UTF-8');
 
     print 'var login = \''.$_SESSION['dol_login'].'\';'."\n";
+	print 'var nowtime = Date.now();';
     print 'var time_auto_update = '.$conf->global->MAIN_BROWSER_NOTIFICATION_FREQUENCY.';'."\n"; // Always defined
-    print 'var time_js_next_test = (Date.now() + time_auto_update);'."\n";
+    print 'var time_js_next_test = (nowtime + time_auto_update);'."\n";
     ?>
 
 	/* Check if permission ok */